/*
 * Copyright (C) 1997-2000 Matt Newman <[email protected]>
 *
 * $Header: /home/rkeene/tmp/cvs2fossil/../tcltls/tls/tls/tlsBIO.c,v 1.2.2.2 2000/07/12 01:54:26 hobbs Exp $
 *
 * Provides BIO layer to interface openssl to Tcl.
 */

#include "tlsInt.h"

/*
 * Forward declarations
 */

static int BioWrite	_ANSI_ARGS_ ((BIO *h, char *buf, int num));
static int BioRead	_ANSI_ARGS_ ((BIO *h, char *buf, int num));
static int BioPuts	_ANSI_ARGS_ ((BIO *h, char *str));
static long BioCtrl	_ANSI_ARGS_ ((BIO *h, int cmd, long arg1, char *ptr));
static int BioNew	_ANSI_ARGS_ ((BIO *h));
static int BioFree	_ANSI_ARGS_ ((BIO *h));


static BIO_METHOD BioMethods = {
    BIO_TYPE_TCL, "tcl",
    BioWrite,
    BioRead,
    BioPuts,
    NULL,	/* BioGets */
    BioCtrl,
    BioNew,
    BioFree,
};

BIO *
BIO_new_tcl(statePtr, flags)
    State *statePtr;
    int flags;
{
    BIO *bio;

    bio = BIO_new(&BioMethods);
    bio->ptr = (char*)statePtr;
    bio->init = 1;
    bio->shutdown = flags;

    return bio;
}

BIO_METHOD *
BIO_s_tcl()
{
    return &BioMethods;
}

static int
BioWrite (bio, buf, bufLen)
    BIO *bio;
    char *buf;
    int bufLen;
{
    Tcl_Channel chan = Tls_GetParent((State*)bio->ptr);
    int ret;

    dprintf(stderr,"\nBioWrite(0x%x, <buf>, %d) [0x%x]", bio, bufLen, chan);

#ifdef TCL_CHANNEL_VERSION_2
    ret = Tcl_WriteRaw( chan, buf, bufLen);
#else
    ret = Tcl_Write( chan, buf, bufLen);
#endif

    dprintf(stderr,"\n[0x%x] BioWrite(%d) -> %d [%d.%d]", chan, bufLen, ret,
		Tcl_Eof( chan), Tcl_GetErrno());

    BIO_clear_flags(bio, BIO_FLAGS_WRITE|BIO_FLAGS_SHOULD_RETRY);

    if (ret == 0) {
	if (!Tcl_Eof( chan)) {
	    BIO_set_retry_write(bio);
	    ret = -1;
	}
    }
    if (BIO_should_read(bio))
	BIO_set_retry_read(bio);
    return ret;
}

static int
BioRead (bio, buf, bufLen)
    BIO *bio;
    char *buf;
    int bufLen;
{
    Tcl_Channel chan = Tls_GetParent((State*)bio->ptr);
    int ret = 0;

    dprintf(stderr,"\nBioRead(0x%x, <buf>, %d) [0x%x]", bio, bufLen, chan);

    if (buf == NULL) return 0;

#ifdef TCL_CHANNEL_VERSION_2
    ret = Tcl_ReadRaw( chan, buf, bufLen);
#else
    ret = Tcl_Read( chan, buf, bufLen);
#endif

    dprintf(stderr,"\n[0x%x] BioRead(%d) -> %d [%d.%d]", chan, bufLen, ret,
	Tcl_Eof(chan), Tcl_GetErrno());

    BIO_clear_flags(bio, BIO_FLAGS_READ|BIO_FLAGS_SHOULD_RETRY);

    if (ret == 0) {
	if (!Tcl_Eof( chan)) {
	    BIO_set_retry_read(bio);
	    ret = -1;
	}
    }
    if (BIO_should_write(bio))
	BIO_set_retry_write(bio);
    return ret;
}

static int
BioPuts	(bio, str)
    BIO *bio;
    char *str;
{
    return BioWrite( bio, str, strlen(str));
}

static long
BioCtrl	(bio, cmd, num, ptr)
    BIO *bio;
    int cmd;
    long num;
    char *ptr;
{
    Tcl_Channel chan = Tls_GetParent((State*)bio->ptr);
    long ret = 1;
    int *ip;

    dprintf(stderr,"\nBioCtrl(0x%x, 0x%x, 0x%x, 0x%x)", bio, cmd, num, ptr);

    switch (cmd) {
    case BIO_CTRL_RESET:
	num = 0;
    case BIO_C_FILE_SEEK:
    case BIO_C_FILE_TELL:
	ret = 0;
	break;
    case BIO_CTRL_INFO:
	ret = 1;
	break;
    case BIO_C_SET_FD:
	BioFree(bio);
	/* Sets State* */
	bio->ptr = *((char **)ptr);
	bio->shutdown = (int)num;
	bio->init = 1;
	break;
    case BIO_C_GET_FD:
	if (bio->init) {
	    ip=(int *)ptr;
	    if (ip != NULL) *ip=bio->num;
		ret=bio->num;
	} else {
	    ret= -1;
	}
	break;
    case BIO_CTRL_GET_CLOSE:
	ret=bio->shutdown;
	break;
    case BIO_CTRL_SET_CLOSE:
	bio->shutdown=(int)num;
	break;
    case BIO_CTRL_EOF:
	dprintf(stderr, "BIO_CTRL_EOF\n");
	ret = Tcl_Eof( chan);
	break;
    case BIO_CTRL_PENDING:
	if (Tcl_InputBuffered(chan))
	    ret = 1;
	else
	    ret = 0;
	dprintf(stderr, "BIO_CTRL_PENDING(%d)\n", ret);
	break;
    case BIO_CTRL_WPENDING:
	ret=0;
	break;
    case BIO_CTRL_DUP:
	break;
    case BIO_CTRL_FLUSH:
	dprintf(stderr, "BIO_CTRL_FLUSH\n");
	if (
#ifdef TCL_CHANNEL_VERSION_2
	    Tcl_WriteRaw(chan, "", 0) >= 0
#else
	    Tcl_Flush( chan) == TCL_OK
#endif
	    ) {
	    ret = 1;
	} else {
	    ret = -1;
	}
	break;
    default:
	ret = 0;
	break;
    }
    return(ret);
}

static int
BioNew	(bio)
    BIO *bio;
{
    bio->init = 0;
    bio->num = 0;
    bio->ptr = NULL;
    bio->flags = 0;

    return 1;
}

static int
BioFree	(bio)
    BIO *bio;
{
    if (bio == NULL)
	return 0;

    if (bio->shutdown) {
	if (bio->init) {
	    /*shutdown(bio->num, 2) */
	    /*closesocket(bio->num) */
	}
	bio->init = 0;
	bio->flags = 0;
	bio->num = 0;
    }
    return 1;
}